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Every URL carries an instrument preset and optional A4 reference. Bookmark tunings and open whichever you need.

t00n.app/guitar

Guitar, A4=440

t00n.app/bass/442

Bass, A4=442 Hz

t00n.app/ukulele

Ukulele tuning

t00n.app/violin

Violin tuning

t00n.app/432

Chromatic, A4=432 Hz

A4 reference is in Hz (400–480 range). Preset and reference can appear in either order. # works too if your host strips paths.

t00n is part of 0fam — a family of small, focused web apps from 0utput. Pitch detection runs locally in your browser; audio never leaves your device. No accounts, no ads, no tracking.